wm8862 Wolfson Microelectronics plc, wm8862 Datasheet

wm8862

Manufacturer Part Number

wm8862

Description

Multi-channel High Definition Audio Codec

Manufacturer

Wolfson Microelectronics plc

Datasheet

1.WM8862.pdf (17 pages)

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DESCRIPTION

The WM8862 is a high performance PC audio subsystem for

use in notebook, netbook, MID and tablet devices where a high

level of audio performance is demanded. It is designed to

minimise supporting components and board area, and enables

the system designer to improve audio performance of a PC

system while minimising design and implementation time.

The WM8862 is fully compliant with the High Definition Audio

(HDA) interface specification (Revision 1.0), and also with the

low-power DCN HDA015-B and dual-voltage DCN HDA024-A.

The device supports two stereo, single-ended analogue

microphone/line inputs. This enables support for up to two

analogue microphones inbuilt to a notebook screen, with

simultaneous

connections. Microphone pre-amps are available, providing up

to +30dB boost gain; a further pair of analogue PGAs provide an

additional ±12dB of fine gain control. Two independent low-

noise ECM bias sources are provided, further reducing the

external system component count. The analogue inputs are

digitised using high-performance multi-bit sigma-delta stereo

ADCs.

Up to four digital microphones can be connected to the

WM8862, providing support for advanced microphone arrays,

eg. built into the lid of a portable PC system. Configurable notch

filters are provided for the analogue or digital inputs, enabling

known system noise sources (such as optical drives or fans) to

be filtered from the audio input paths.

The WM8862 provides two stereo, 24-bit sigma-delta hi-fi DACs,

supporting sample rates up to 192kHz. A ground-referenced

headphone driver is provided, powered by an integrated charge

pump, providing a true hi-fi performance output.

A stereo 2W/channel high-efficiency Class D speaker driver is

also

incorporated in the speaker path, enabling loudspeaker

compensation to be realised using Wolfson’s ReTune™ feature.

Programmable compression / loudness control is also possible

using the Dynamic Range Controller (DRC). This can be used at

a hardware level to prevent very loud signals being applied to

the speakers, avoiding distortion and damage.

Jack detect, GPIO functionality and an S/PDIF transmitter fully-

compatible with IEC-60958-3 are also provided.

The CODEC and output drivers can operate from a single +5V

supply, deriving all other necessary voltages using integrated

regulators. The WM8862 supports separate I/O domains for the

HDA interface and for the other digital interface pins, providing

maximum system flexibility. The WM8862 is supplied in a small

48-pin QFN package.

WOLFSON MICROELECTRONICS plc

provided.

support

Multi-Channel High Definition Audio CODEC

Advanced

for

external

digital

http://www.wolfsonmicro.com/enews

signal

microphone/line

processing

input

FEATURES



APPLICATIONS



High performance computing

Notebook PC

Netbook PC

Mobile Internet Devices (MID)

Tablets

Complete PC Audio Subsystem

Fully Compatible with High Definition Audio Revision 1.0

Microsoft WLP Windows 7 logo compliant

Two Stereo Microphone/Line Inputs

Stereo Capless Headphone/Line Output

Stereo Class D Speaker Output

Dynamic Range Controller

Wolfson ReTune™

Single-ended analogue microphone support

Integrated dual microphone bias with impedance detect

Four-channel digital microphone support

Ground referenced stereo headphone driver

2W/channel stereo Class D speaker drivers

IEC-60958-3 compatible S/PDIF transmitter

Jack detect support

GPIO Functionality

EAPD support to control external subwoofer amplifier

Digital beep generator with legacy analogue beep support

Integrated Power Management

Independent digital I/O voltage domains:

48-pin 7mm x 7mm QFN package

 Full support for low-power DCN HDA015-B

 Full support for dual-voltage interface DCN HDA024-A

 Microsoft Windows Vista premium logo compliant

 96dB SNR (‘A-weighted’)

 -85dB THD

 44.1kHz to 96kHz sample rate support

 0dB to +30dB Mic boost, ±12dB PGA

 105dB SNR (‘A-weighted’)

 -80dB THD (P

 -90dB THD (0dBFS into 10kΩ)

 44.1kHz to 192kHz sample rate support

 100dB SNR (‘A-weighted’)

 -70dB THD (P

 1% THD (P

 Compression and loudness on playback path

 Speaker compensation

 4 Jack detect logic inputs

 Support for combi-jacks, with impedance sensing

 Low power operation

 Integrated LDOs create required analogue and digital

 HDA interface (DBVDD2): 1.41V to 3.6V

 Other digital (DBVDD1): 1.62V to 3.6V

core supplies from +5V

=2W into 4Ω)

=1W into 4Ω)

= 40mW into 16Ω)

Product Brief, January 2012, Rev 2.1

WM8862

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